How come we can see all matter even despite being limited in seeing a range of frequency?

Saw this question posed on another forum and thought it would also bring some healthy debate here as well.

We can see an apple because it reflects red light. A frequency of light we can see. Why is there no object on earth that only reflects a light
frequency that we cannot see. Like UV. Let us say that there is an object that only reflects UV or IR frequencies. These objects are real physical
objects but cannot be seen by the human eye. Since the earth is supposed to be random, these object should actually exist. Why don't they?

They do, flowers use those frequencies to aid in attracting bees. Obviously the Bees sight range is much higher due to being not considered a
"conventional" mammal eye, and the plants learned how to look pretty in those ranges too

Well there was another good question posed as well seeking a response which I think directly correlates to the question.

How would we know if we see all matter? I'm seriously asking, there are theoretical particles we can't see, I'm not convinced we understand
time, and I suspect other dimensions overlap ours at different speeds.

I think there's been some attempts in the animal kingdom, like this glass squid;

Most animals, however, find it easier to mimic the common background of their habitats, like white in winter, as a blending strategy.

I think a better question would be as to whether there's any artificial substance that could be manufactured that is opaque only to "invisible"
frequencies, or, even better, a substance that can be manufactured that's entirely transparent to everything.

If a subject does not reflect a certain spectrum of light, it absorbs it doesn't it? So, if it absorbs all the "visible light" spectrum (visible by
humans) and only reflects those frequencies that the human eye cannot see, then wouldn't that subject appear black (absorbing the entire "visible
light" spectrum) to a human? Also, it would still block that light, and cast a shadow, would it not?

Trust me there are many things that don't absorb visible like most polymers, pretty much all that is opaque and don't have colors. You can see it
because they scatter light. All polymers absorb uv due to c-c bonds but they need special chromophore groups to absorb visible

For uv spectroscopy quartz is used as it does not absorb in any of the uv-vis spectra and quartz is natural

Do you see oxygen, nitrogen, CO2, hydrogen or helium, amongst other gases? most molecules are made up of a variety of atoms, which radiate at
different frequencies. We see those frequencies we can see, and don't see the ones we can't. And apparently there is no matter made up solely of
stuff that doesn't radiate light in are vision spectrum, otherwise there would be be splotches of black every so often that we would bump into.

Maybe they do exist but we are looking for them incorrectly. Perhaps we are looking and trying to see them from the wrong two eyes.

"We know it exists, it's just we can't see it!"
I heard this phrase number of times coming from scientists when they're speaking about dark matter.
Simple logic would be that there is whole another world governed with different laws of physics.

This content community relies on user-generated content from our member contributors. The opinions of our members are not those of site ownership who maintains strict editorial agnosticism and simply provides a collaborative venue for free expression.